Feng Shui looks at how the placement of things and objects within the space affect the energy flow in your environment, and how these objects interact with and influence your personal energy flow.
The boys would throw all kinds of foam boats and objects down the river and see which ones would drown and how different objects would impede the flow.
Dr Perelman overcame this difficulty by cutting off the singularities, continuing with the Ricci-flow application and then rejoining the transformed objects later.